Tube forming machine for multilayer material webs comprising paper or the like substances



1967 F. F. BROCKMULLER 3,

TUBE FORMING MACHINE FOR MULTILAYER MATERIAL WEBS COMPRISING PAPER OR THE LIKE SUBSTANCES Filed July 31, 1962 2 Sheets-Sheet 1 J0 venfor:

1967 F. F. BROCKMULLER 3,296,057

TUBE FORMING MACHINE FOR MULTILAYER MATERIAL WEBS COMPRISING PAPER OR THE LIKE SUBSTANCES Filed July 31, 1962 2 Sheets$heet 2 Patented Jan. 3, 1967 3,296,057 TUBE FORMING MACHINE FOR MULTILAYER MATERIAL WEBS COMPRISING PAPER OR THE LIKE SUBSTANCES Friedrich Franz Brockmiiller, 50 Schulstrasse,

Lengerich, Westphalia, Germany Filed July 31, 1962, Ser. No. 213,755

Claims priority, application Germany, Aug. 8, 1961,

W 30.494 4 Claims. (Cl. 156-548) This invention relates to a tube forming machine for multilayer material webs comprising paper or the like substances and more specifically to a tube forming machine of this kind which is used in the manufacture of multiwall bags having staggered bottoms.

In the manufacture of multiwall bags, tube forming machines are known wherein multilayer material webs of paper or the like substances are provided with weakening lines extending transversely to the direction of travel of the web, which are offset from one another. In addition, adhesive stripes are applied, likewise disposed transversely of the web. The weakening or perforating lines and the adhesive stripes of the webs are somewhat offset with respect to each other so that, when the webs come together at the collecting roller, the weakening lines of the webs are staggered with respect to each other and the webs connected by the adhesive stripes situated adjacent to the weakening lines. Following this, longitudinal adhesive stripes are applied onto the webs which are then folded and glued together so as to form a tube. This tube is now fed to an adequate severing device where it is severed at the weakening lines into individual tube sections having staggered ends. The tube sections formed in this way in the tube forming machine are afterwards fed to another machine where they are folded into bags having a flexible bottom.

The present invention relates to such tube forming machines and concerns the development thereof between the device for making the weakening lines and the collecting roller for folding the webs being provided with weakening lines and transverse adhesive stripes.

In machines of this type designed for a larger number of webs, e.g. for six webs, it has already been proposed to provide the weakening lines and the adhesive applying devices perpendicularly one above the other, whereby the lengths of the webs between the individual transverse pasting devices and the point where the web converges, and likewise the lengths of the web between the weakening devices and the point of convergence of the web are substantially of the same length. By this means variable extensions of the individual webs through stretching which may lead to variable stagger motions of the web folded together on the collecting roller, have been avoided.

Moreover, a simplification of adjusting the machine has been attained because thereby the transverse adhesive applying devices together and the weakening devices together were running in same rhythm.

However, it could not be prevented that the webs were hit by sprays of adhesive, while in the adhesive applying devices, by spraying off and thus glued together at undesirable spots, whereby the further manipulation of the workpieces was disturbed. To avoid spraying, the machine speeds had to be reduced considerably.

The invention thus concerns the problem of developing the adhesive applying device in such a manner that the above mentioned advantages will be maintained and so that adhesive sprayed from the glue applicators can no longer get to the web, whereby the individual lengths of the web between the adhesive applying devices and the collecting roller are invariable or deviate from each other at least only to such an extent that an operation of the adhesive applying device in rhythm with each other and a synchronous joint adjustment of all adhesive applying devices is possible. Minor deviations of the aforementioned same web lengths may indeed result in spite of the fact that of the adhesive applying devices run in the same rhythm with each other for compensating differences due to the elastic properties of the individual webs.

For solving this problem, it is suggested that the adhesive applying devices be provided in a staggered relationship one above the other, the staggering being in a direction opposite that of the webs movement, and that in the space becoming free thereby above said adhesive applying roller, the counter roller of the adhesive applying roller and a further guide roller be arranged, in such a manner that the side of the web which contacts the adhesive applying roller is guided as web underside between the counter roller and the guide roller.

An object of the invention, therefore, is to improve the adhesive applying devices in such a way that any flying-off adhesive can no longer get onto the webs, thereby avoiding the serious disadvantage of the webs agglutinating in undesired spots.

A further object of the invention is to execute the said improvements to the adhesive applying devices without impairing the condition that the webs are of the same length between the weakening or perforating devices, the adhesive a plying devices, and the collecting roller.

Further details of the invention shall be explained with the aid of an exemplary embodiment represented in the accomnan ing drawings, wherein:

FIGURE 1 is a side elevation of a portion of a tube forming machine for multilayer webs of paper or the like substances, developed in accordance with the present invention.

FIGURE 2 is a side elevation showing an adhesive applying device in accordance with the invention.

FIGURE 3 is a side elevation showing a known arrangement of the adhesive applying devices provided perpendicularly one above the other.

FIGURE 4 is a side elevation showing a known adhesive applying device.

As shown by FIG. 3, the known vertical arrangement of the transversely disposed adhesive applying mechanisms 1, 2, 3 compels conducting away the webs 4, 5 and 6, partly wound around the coordinated applying rollers 7, 8 and 9, from said mechanism. Due to the vertical arrangement of the individual adhesive applying mechanisms one above the other the counter'rollers 7 to 9 of said adhesive applying rollers must be substantially provided laterally to said applying rollers 10 to 12. Owing to this arrangement, as shown by FIG. 4, any adhesive material 13 spraying tangentially off in connection with applying the adhesive or becoming free by drawing filaments now hits, when dropping down to the web, whereby troublesome agglutinations of the web occur in the interior of the bag, causing disturbances during further processlng.

For remedying this undesirable condition, the adhesive applying mechanisms 14 to 18 (FIG. 1) are provided one above the other staggered in a direction opposite to the direction of travel of the web. Due to this staggered arrangement, a free space arises above the adhesive applying roller used in accordance with the invention, in which a further guide roller 32 is provided for conducting away the associated web in approximately the same direction as it approached the roller. By this means, the side of the web facing the adhesive applying roller 31 is an underside, and by no means, as it is the case in the known types of arrangements, an upperside. Further, the counter roller 30 (FIG. 2) of the adhesive applying roller can be arranged ,at a substantially higher level relative to said applying roller 31 than is possible in the case (FIG. 4)

of the known arrangement. Any adhesive particles being sprayed off tangentially, or freed by tearing of adhesive filaments, therefore, fall back to the adhesive applying rollers and do not get on to the paper webs, as represented in FIG. 2.

Equal lengths of the webs 19 to 23 from the transverse adhesive applying devices to the collecting roller 25 are produced by conducting the webs 19 to 22 over individual guide rollers 26 to 29, for compensation. As can be seen from the arrangement of FIGURE 1, each of the individual guide rollers 26 to 29 is spaced transversely from a line between that guide roller 32 (FIGURE 2) and that deflecting roller (4550) associated with the same web by a distance sufficient to create equal web lengths for all of the Webs between the adhesive applying rollers and the collecting roller. For compensating different elasticity of the individual webs the reorientation or deflection rollers 45 to 50 can be provided adjustably for a slight amount. The web lengths between the adhesive applying devices 14 to 18 and the collecting roller 25 are exactly the same in the intermediate position of adjustment of deflection rollers 45 to 50, so that substantially equal lengths between adhesive applying devices and collecting roller are maintained and the adhesive applying rollers cooperate together in the same rhythm.

As shown by FIG. 1, the weakening devices 33 to 38 are likewise arranged in a staggered relationship one above the other in a direction opposed to that of the web course, whereby equal web lengths are attained between the adhesive applying devices and the weakening devices, so that these also run together at same rhythm and can be jointly adjusted together.

Accordingly, the present invention brings about a considerable improvement in the tube forming machines by avoiding any disturbing agglutinations between the Webs while making staggered hoses and by allowing thereby an increase in machine speed and the machine output.

What I claim is this: I

'1. A tube forming machine for producing multi-layer material from a plurality of webs, comprising, in combination:

a plurality of web weakening devices, each for transversely weakening one of said webs;

a plurality of means each for applying transverse adhesive stripes to one of said webs, each said means including (1) an adhesive applying roller for applying adhesive to its associated web,

(2) a counter roller disposed above the horizontal center line of said adhesive applying roller adjacent the circumference of the latter, and

(3) a first guide roller disposed above the level of said counter roller and spaced from the adhesive applying roller;

a collecting roller for collecting all of the webs and for bringing them into contact with one another for bonding;

a plurality of deflecting rollers, each for guiding one of the webs to the collecting roller, each web being in: dividually guided through the counter roller and first guide roller of its associated adhesive applying device, so that the underside of the web faces the adhesive applying roller between the counter roller and first guide roller; and

a plurality of individual second guide rollers for equalizing the lengths of the webs between said adhesive applying rollers and said collecting roller, each said second guide roller being spaced transversely from aline between that said first guide roller and that said deflecting roller associated with the same web by a distance sufficient to create equal web lengths for all of said webs between said adhesive applying rollers and said collecting roller.

2. A tube forming machine as defined in claim 1,

wherein said weakening devices are arranged one above the other and staggered relative to each other, in a direction opposite to the direction of travel of the webs, so

that the web length between the weakening device and the adhesive applying device is the same for all webs, whereby the weakening devices cooperate in the same rhythm.

3. A -tube forming machine as defined in claim 1, wherein said adhesive applying rollers are arranged one above the other and said individual second guide rollers are arranged so that the vertical distance between each individual second guide roller and its associated adhesive applying means decreases from the lowest to the highest of said second guide rollers, so that the web lengths between the adhesive applying means and the collecting roller are all equal, and the adhesive applying devices cooperate in the same rhythm.

4. An arrangement as defined in claim 1 wherein each said first guide roller is arranged for causing its associated web to leave its associated adhesive applying roller substantially on a tangent.

References Cited by the Examiner UNITED STATES PATENTS 1,787,404 12/1930 Taylor et al. 156-320 2,086,191 7/1937 Rutkoskie 118202 2,238,695 4/1941 Hallrnan 118202 2,380,047 7/1945 Hyman 118-212 2,396,946 3/1946 Grupe 1l8-212 2,759,523 8/1956 Goldstein et a1. 161-137 EARL M. BERGERT, Primary Examiner.

R. 1. SMITH, M. L. KATZ, Examiners. 

1. A TUBE FORMING MACHINE FOR PRODUCING MULTI-LAYER MATERIAL FROM A PLURALITY OF WEBS, COMPRISING, IN COMBINATION: A PLURALITY OF WEB WEAKENING DEVICES, EACH FOR TRANSVERSELY WEAKENING ONE OF SAID WEBS; A PLURALITY OF MEANS EACH FOR APPLYING TRANSVERSE ADHESIVE STRIPES TO ONE OF SAID WEBS, EACH SAID MEANS INCLUDING (1) AN ADHESIVE APPLYING ROLLER FOR APPLYING ADHESIVE TO ITS ASSOCIATED WEB, (2) A COUNTER ROLLER DISPOSED ABOVE THE HORIZONTAL CENTER LINE OF SAID ADHESIVE APPLYING ROLLER ADJACENT THE CIRCUMFERENCE OF THE LATTER, AND (3) A FIRST GUIDE ROLLER DISPOSED ABOVE THE LEVEL OF SAID COUNTER ROLLER AND SPACED FROM THE ADHESIVE APPLYING ROLLER; A COLLECTING ROLLER FOR COLLECTING ALL OF THE WEBS AND FOR BRINGING THEM INTO CONTACT WITH ONE ANOTHER FOR BONDING; A PLURALITY OF DEFLECTING ROLLERS, EACH FOR GUIDING ONE OF THE WEBS TO THE COLLECTING ROLLER, EACH WEB BEING INDIVIDUALLY GUIDED THROUGH THE COUNTER ROLER AND FIRST GUIDE ROLLER OF ITS ASSOCIATED ADHESIVE APPLYING DEVICE, SO THAT THE UNDESIDE OF THE WEB FACES THE ADHESIVE APPLYING ROLLER BETWEEN THE COUNTER ROLLER AND FIRST GUIDE ROLLER; AND A PLURALITY OF INDIVIDUAL SECOND GUIDE ROLLERS FOR EQUALIZING THE LENGTHS OF THE WEBS BETWEEN SAID ADHESIVE APPLYING ROLLERS AND SAID ROLER, EACH SAID SECOND GUIDE ROLLER BEING SPACED TRANSVERSELY FROM A LINE BETWEEN THAT SAID GUIDE ROLLER AND THAT SAID DEFLECTING ROLLER ASSOCIATED WITH THE SAME WEB BY A DISTANCE SUFFICIENT TO CREATE EQUAL WEB LENGTHS FOR ALL OF SAID WEBS BETWEEN SAID ADHESIVE APPLYING ROLLERS AND SAID COLLECTING ROLLER. 